I stick to whatever is most comedic or interesting, such as running into rooms with a shotgun firing in a way that syncs to the tune of "Banana Phone". as for moral compus, I might as well be in the center of the earth. I shoot through hostages, burst into rooms to only shoot those I'm supposed to save. And if the morally bad choice gives me something cool I'll take it, then turn to the guy giving it to me and bash his head in with it.
Although sometimes I try to be good, does not last.
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I do whatever happens to benefit my character the most at a given time. Sometimes I'm the good guy, sometimes I'm a complete asshole. In most rpgs with a measuring system I end up being completely neutral. That being said, while I do end up being neutral, I tend to enjoy asshole dialog optipns.